Condition control apparatus



Feb. 7, 1933. sMlTH 1,896,207

CONDITION CONTROL APPARATUS Filed Feb. 14, 1951 7 Sheets-Sheet 1 7- r1r-r 0 Z2 I v 1 INVENTOR ,f L1

W 22 PM ATTORNEY Feb. 7, 1933. H J s n- 1,896,207

CONDI T I ON CONTROL APPARATUS Filed Feb. 14, 1931 7 Sheets-Sheet 2 INVENTOR rr u M 1 41-5- P N ATTORNEY Feb. 7, 1933.

H. J. SMITH CONDITION CONTROL APPARATUS Filed Feb. '14, 1931 7 Sheets-Sheet 3 Feb. 7, 1933. H. J. SMITH CONDITION CONTROL APPARATUS Filed Feb. 14, 1931 7 Sheets-Sheet 5 I INVENTOR Q/ m. s. PJM

ATTORNEY Feb. 7, 1933. H. .1, SMITH CONDITION CONTROL APPARATUS Filed Feb. 14, 1931 7 Sheets-Sheet 6 mvzuyon M BY W3 Y E N R O n A Feb. 7, 1933. H. J. SMITH CONDITION CONTROL APPARATUS Y Filed Feb. 14, 1931 7 Sheets-Sheet 7 Circuit 6' A'ITORNEY Patented Feb. 7, 1933 UNITED STATES-PATENT OFFICE HAZOR J. SMITH, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR I TO SUPEBSTAT COMPANY, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHU- BETTS CONDITION CONTROL APPARATUS Application filed February 14, 1981. Serial No. 515,787.

4 This invention relates to an apparatus for automatically controlling temperatures and/ or pressures and furnishes a'means for directly varying the supply of heat or pressure to compensate for wide or narrow fluctuations in temperature or pressure.

This invention provides means for maintaining substantially constant predetermined pressure as, for instance, in a steam boiler where constant steam pressure is desired. The device is adapted to compensate for large drops in pressure due to excess use of steam or to compensate for slight variations in pres- ?ure where the amount of steam consumed is ess.

This invention is also useful in maintaining substantially constant temperatures in apparatus such' as calender rolls for rubber mills. -It rovides a means for operating the valves which control the heating and coolin mediums. It permits the valves to be opene wide to compensate for abnormal variations in temperature, and gradually closed as the temperature reaches the redetermined point. It also opens or closes t e valves so as to substantially maintain the. tem' eratures balanced under n rmal working con itions.

This invention also provides a remote control for various types of a paratus, such for I proper rate of com ustion necessa instance as the ventilators 1n foundries or die casting plants, wherein the tem erature varies according to the amount 0 molten metal present and the temperature of the outside atmosphere. By means of this'invention, the ventilators may be opened or closed to maintain the desired temperature conditions.

This invention is particularly adapted for automaticallyregulating the temperature of rooms by-regulating the drafts and fuel sup.- ply of house-heatin apparatus whereby t e to furnish the desired temperature may e maintained. In view of its particular adaptability for this urpose, this invention is illustrated and escribed in connection. witha house-heating up aratus- It is to be understood, however, t at m invention is in no wise limited in its brea th particular use described.

Heat control devices have heretofore been and scope to the used consisting of means for automatically controlling thetemperature by controlling the rate of combustion. These control devices generally consisted of heat responsive means which were operatively connected to and adapted to actuate the draft control means and/or the fuel suppl means of the heater. These devices, in t e event more heat was required instantly opened the draft control means and/or the fuel sup ly to their maximum limits, and likewise w en the desired temperature was reached, these means were instantly and com letely closed. For house-heating purposes tllese thermostats are ggperally a (i'usted between 68 and 70.

ey are so evised-that when the temperature dro s below 68 the draft control means and/or uellsu ply is opened to the maximum limits, w ereas when the tem erature arises above 70, the draft contro means and/or fuel su ply is completely closed. The operation 0 these devices is exactly the same whether it is desired to raise the temperature '2 or 20. The result thereof is that while set to operate within a temperature .inge of 2", as a matter of fact, the' variation in tem erature is often as "wide as 10. It is o'vious that, since the draft and/or fuel supply is completely closed at the time when the room is at the predetermined temperature, and since the heatin device is not sufliciently flexible to respon instantly to the opening of the drafts or the fuel supply, the temperature of the room will continue to drop, at times going as low as 64 or 65 before there is an appreciable increase in temperature. Li ewise when the maximum tem erature of 70 is reached, and the drafts an or fuel supply is completely closed, the coa will continue to burn for a a scribed and constituting one specific modification of this invention, the elements governing the rate of combustion may be so controlled that they may be opened from the closed position or any other position to the maximum open position, should the c0nditions require it, and radually closed as the temperature approac es the desired degree. Though the means controlling the rate of combustion may be opened to the maximum limits when the temperature of the room requires it, as for instance in increasing the.

temperature from night temperature to day temperature, in most instances, and particularly when the difference in temperature is small, these means are only modulated to the extent necessary .to maintain the temperature at the desired degree.

It is therefore an object of this invention to provide a means for automatically sub stantially maintaining predetermined ternperatures.

Another object of this invention is to provide a heat controlled mechanism to gradually operate the elements necessary to inposition up to the maximum limit as deter-' mined b the difference in-temperature desired an the actual temperature. I

Other objects will up ear from the following descri tion, append ed claims and accompanying rawings showing one modification of an apparatus constructed in accordance A with the principles'of this invention.

Figure 1 is'a side elevation of the control unit.

, Figure 2 is a front view of the control unit with the covering removed. j Figure 3 1s a section taken on lines 3-3 I of Flgure 2.

Figure is a front elevation of the motor mechanism and its appurtenant parts for olperatrng the combustion control means with t e casing removed. Figure 5 is a top- In view of the mechanism illustrated in gure 4.

' Figure 6 is a side elevation of the mechanism illustrated in Figure 4 as viewed from the right. i

Figure 7 is a diagrammatic illustration of the a paratus constituting this invention in combination with a coal heating system.

Figure 8 is a sideaelevation of a modified casing removed. 7

Figure 9 is a front elevation of my modified construction shown in Figure 8.

form of my invention, with the side of the.

ings, contemplates an apparatus for controlling the' rate of combustion in a suitable heating system, whereby the temperature of the room served by the heating s stem is maintained at any predetermined egree, such as, for instance, 68 F. In accordance with the principles of this invention, a control unit including a heat responslve element controlling a motor circuit is (provided, whereby, when said circuit is close ,the elements, such as the drafts and/or the fuel supply, are opened, closed or maintained at the necessary position to increase, decrease or maintain the rate of combustion to produce the predetermined temperature or pressure.

The" apparatus isso constructed that the means controlling the combustion are gradually "opened and/or closed, the maximum opening being obtained only when it 1s necessary to obtain a rate of combustion to raise the temperature of the heating system a substantial amount. When the variations in. temperature are small, the elements governing the rate of combustion are opened or closed to the degree necessary to maintain the desired'tempe'rature. .In other words the device exercises a modulated or balanced controlofthe combustion responsive to changes in temperature.

The apparatus, as is apparent from the preceding, consists of a control unit and a motor mechanism, said motor mechanism through suitable transmissions controlling the elements governing the rate of combustionin the heating system.

Referrin' to the drawings, Figures 1 to 3 inclusive i1 ustrate the control mechanism. base l-is providedwith a peripheral flange 2 and a cover 3. Mounted on the base 1 and preferably integral therewith are flanges 4 and 5. Also mounted on the base is a bracket construction of sylphon bellows are well known, no further descri tion, thereof is nec- V essary. The sylphon be lows 12 is provided at its'other -end with a conical pin 13 adapted to seat in the depression 10 on the lever 7. A threaded bushing 16 is mounted in the bracket 5. A pin- 14 is mounted slidablynn the bushing 16'. The pin 14 is provided Wlth the conical end ada ted to on age the depression- 11 on the ever 7. T e pm 14 1s rovi'ded with 'a washer 15. A s ring 17 is eld between the washer 15 and t e bushing 16 and tends to or e the pin 14 forward into engagement with t e lever 7. The spring 17 tends to counter-balance or o pose the action of the sylphon bellows 12. lhe bushing 16 is provided with an indicator handle 16'. The casing 3 is provided with a dial marked off to indicate degrees. The rotation of the handle 16' advances or retracts the bushing 16 and increases or decreases the tension on the sprin 17, thereb varying the operative effect of the sylphon bellows 12.

In place of the pin 14 and'the spring 17 I may substitute a bellows, similar to 12, mounted on a threaded base adapted to be turned in the threaded bushing 16. This sylphon bellows I may-fill with air or other suitable gas to a predetermined degree through a suitable valve, such as a. tire valve, thereby providing a different type of resilient means to oppose the action of the bellows 12.

Pivot-ed on the lower end of the lever 7 at 18 is a second lever 19, preferably made from insulating material. The lever 19 is provided with metal contact members 21 and 22. Mounted on the base 1 by means of the binding posts 23 and 24 are the adjustable contacts 25 and 26. The adjustment of these contacts is effected by means of the nuts 27 and 28. The contact 25 is ada ted to contact with the contact 21 on the ever 19 and the contact 26 is adapted to contact with the contact 22 on the lever 19. The contacts 21, 25 and 22, 26 comprise a double-throw switch constituting in effect a pair of reversing switches. The lower end of the lever 19 is provided with brushes 29 and 30. The brush 29 is connected through the lead 31 with the contact member 21. The brush is connected through a lead 32 with the contact member 22. The binding posts 23 and24 are connected to the motor mechanism by means of a pair of wires 33 and 34, one of which is shown in Figure 3. Mounted on the lower.

' end of the base 1 are two series of contact members 35 and 36. The contact members 35 are adapted to be enga ed by the brush, 29 whereas the contact mem ers 36 are adapted to be engaged by the brush 30. The contact 29 with the series of contacts 35 and the contact 30 with the series of contacts 36 constitute step-by-step connecting switches. Each element of the contact members 35 and 36 is connected by wires to the motor mechanism afterwards to be described. 1

The motor unit is illustrated in Figures 4,

I '5 and 6. It consists of a base 37 to which is v o crating arms ma integrally connected an u right panel 38. Bolted to the base 37 are e ectric motors 39 and 40. The upright panel 38 is provided with two brackets 41 and 42. Mounted on the brackets 41 and 42 is an oscillating shaft 1 or spindle 43. This spindle is provided with hexagonal ends 44 and 45 to which add tional be attached. The upright panel 38' is so provided with brackets 46 and 47. Loosely mounted on the s indie 43 are gears 50, 51, 52 and 53. see

gears are free to rotate on the shaft 43. The beveled gears 52 and 53 are secured to the gears 50 and 51 respectively so that gears 50 and 52 rotate in unison, whereas the gears 51 and 53 rotate in unison. The motors 39 and 40 are provided with gears 54 and 55 respectively. Mounted on the b. kets 46 and 47 by means of the studs 56 and 57 are the gears 58, 59, and 61. The-gears 58 and 59 are adapted to rotate in unison, whereas, the gears 60 and 61 are adapted to rotate in unison. The gear 58 meshes with the gear 54 on the motor 39 whereas the gear 60 meshes with the gear 55 on the 'motor 40. The gear 59 meshes with the gear 50 whereas the gear 61 meshes with the gear 51.

Mounted on the shaft or spindle -43 by means of a bushing 62 is an operating arm 63. This arm is pinned to the spindle 43 and oscillates therewith. This arm carries a beveled gear 64 adapted to mesh with the beveled gears 52 and 53. The beveled gear 64 is freely rotatable on the arm 63 and is held in :lace by means of the nut 65.

lamped to the shaft 43 and adaptedto rotate therewith is a pair of commutators-66 and 67 respectively, which are insulated from the shaft '43 by the insulating bushings 48 and 49 respectively. The commutator 66 has an arcuate surface 68 while the commutator 67 has a corresponding surface 69.

70. 71, 72, 73, 74, 75, 76, 77, 78, 79,80 and 81. The brushes 71 to 75 are electrically connected respectively to the binding posts A1, A2, A3, A4 and A5. The brushes 77 to '81 are electrical] connected respectively to the binding posts 1, B2, B3, B4 and B5., The binding osts Ml, A1, A2, A3, A4, A5, M2, B1,' B2,

3, B4 and B5 are electrically connected to the control apparatus illustrated in Figures 1 to 3 inclusive, as will hereinafter be described. It is to be noted that the arcuate surfaces 68 and 69 of the commutators 66 and 67 have staggered edges so that as the commutators rotate with the shaft 43, some or all of the brushes will be in contact with the commutators, depending upon the position of said commutators and the position of the shaft 43. This is shown in Figure 5 wherein four brushes are shown in contact and two brushes are shown out of contact with the surface 68 of. the commutator 66. Likewise,

four brushes are shown in contact and two brushes shown out of contact with the surface 69 oftho commutator 67. The commututors and brushes above described constitute step-by-step operating and disconnecting switches.

The brush is connected to the motor 39 whereas the brush 76 is connected to the motor 40. Bindin posts M1 and M2 are connected to one si e of the supply circuit. The wire 33, heretofore described as being nected to the binding post 23 is connected to Mounted on the .panel 38 are the brushes I conthe binding post M1 whereas the electrical connection 34, which is described as connected to the -binding post 24, is connected to the- B1, B2, B3, B4 and B5 are respectively conbinding postMl, through t nected to the contacts Y1, Y2, Y3, Y4 and Y5 of the contact member shown in Fi re 2. Thecircuit for the motor is as fo lows: Fromthe source of supply through the binding 0st M2, the wire 34, the binding 0st 24, t e contact 26, the contact 22 on the ever .19,'.the lead 32, the brush- 30, the contact member 36.(Y1, Y2 Y3, Y4, Y5), the brushes 77, 78 79, 80 81, through the commutator 67, he brush 76 to" the motor 40, and thence back to the source of supply.

- The'circuit for the motor 39 is correspondin ly as-follows:

hrom the source of sup 1y through the lie lead 33 to the binding post 23, to the contact member 25, to the contact member 21 on the arm 19, through the lead 31 to the brush29 and the contact members 'X1, X2, X3, X4 and X5 on the contact member 35, thence 'to the binding posts A1, A2, A3, A4 and A5'and the brushes 1, 72,73, 74 and 75, through the commutator 66, through the brush 70, through the motor 39 back to thesource of s pply.

Mounted in the 'bushin 62 and extending in the o posite direction roin the operating arm 63 1s a short arm 82. The-panel 38 is provided with two projecting members 83 and 84 which act 'assto s and which are adapted to engage the en of the arm 82 at either end of its travel and thereby limit the oscillation of the shaft 43 and the movement of the operating arm 63. The purpose of limiting the oscillation of the shaft 43 is to prevent-the commutators- 66 and 67 from being; rotated to such an extent that none of the brushes are in contact with the commutators. It is necessary for the operation of this device that the two brushes 70 and 76 remain always in contact with the commutators 66 and 67 respectively. It will be'obviousthat when the commutator 66 has rotated so that brushes 71, 72 78 74, 75 are no longer in contactwith t e ace 68, the brush 70 will be in contact. It isalso obvious thata-ll of the brushes 76 to 81 inclusive will be in con tact with the face 69 of the commutator 67. The reverse is true when only brush 76 is in contact with the face 69 of the commutator 67. All of the brushes 70 to 75 inclusive will be in'contact with the face 68 of the commutator 6,6.

The operation of the device is as follows:

The control apparatus, illustrated in Figure 2, is shown at rest at the predetermined temperature, for instance 70. Upon a dro in temperature the gas pressure m the sy .50 and 52, cause t e the curved of the lever 19 to likewise swing to the left,

to 'closethe circuitthrough contacts 21 and 25. A very slight'movement of the lever 7 is necessary to effectuate this since the lower portionof the lever' 19 is frictionally held against movement by the brushes 29 and 30 resting on some one of the contact points 35 and 36. Thus, in Figure 2, the brushes 29 and 30 are shown resting on. X3 and Y3. Contact having been made with the -.contact oint 25, the circuit will be completed as fol-- ows:Fr0m the source of supply through the binding post M1, through the wire 33, the binding post 23, the contact member 25, the contact member 21, the lead 31, the brush 29, the contact X3 of the contact member 35, throu h the electrical connection leading from 3 to the binding post A3, through-the brush73, through the. commutator-66,- the brush 70 to the motor 39, and'thence back tol the source of supply. The completion of this circuit will cause the motor 39 and its gear 54 to rotate and b means of the gears 58, 59, ar 64'to rotate on the operating arm 63. Since the motor 40 and its train of gearsand the-beveled gear 53 are stationary, the circuit lead to the motor 40 bein broken,.the beveled gear-53 will act as a me and the rotation of the ar 64 on the operating. arm 63 will cause t e gear to descend the rack and lower the operating arm 63, thereby opening the dampers or increa's-- ing the fuel supply. The rocking of the shaft 43 will cause t e brush 73 to .ride ofi the commutator 66 as shown inFigure 5. This will ,break the circuit andcause the arm 63 to come to rest. Should the temperature coutinue to drop, the sylphon bellows 12 will be still further compressed by the action of the s ring 17 and the lever 7 .will swing still furt or to the left. Since the upper part of the lever 19, which is freely. ivoted'at 18 on the lever 7, is in contact wit the contact member at 25, it can move no furtherto the left. This causes the lower part of the lever 19 carrying the brushes 29 and 30 to move to the left, so that the brush 29 will then engage the contact member X2 of the contactmember 85. It will also cause the brush '80 to move .over to the contact member Y4. Since the brush 72 is still in contact with the commutator 66, the motor will again begin operating and the arm 68 will be lowered another step. This movement will continue until the brush 72 runs off ortion- 68 of the commutator 6'). The motor 9 will then sto and there will be no further movement of t e lever 63 unless the temperature continues to drop, in which 13 event the contraction of the sylphon bellows 12 will permit the spring 17 to push the lever,

7 still further to the left, causing the brushes 29 and to ride over and enga e the contact members X1 and Y5 respective y of the contacts and 36. This will again start the motor and cause the lever 63 to fall to 'its maximum position, since the brush 71 will complete the circuit until it passes off the edge of the commutator, breaking the circuit. The arm 63, however, will be stopped from going beyond the maximum point by the engagement of the-short arm 82 against the lug or stop 84.

The 0 ening of the drafts and/or fuel suply 'wil cause an increase in temperature. This will cause the apparatus to reverse, The increased temperature will cause the sylphon bellows 12 to ex and compressing the spring 17, causin the ever7 to move to the right. Since the iower end of the lever 19 is held against free movement by frictional engagement of the brushes 29 and 30 on the contact members 35 and 36, the upper part of the lever 19 will also move to the right, completin the circuit through the contact points 22 an 26. This will com lete the circuit to the motor 40, through the rushes 76 and 81. This will cause the motor to rotate, rotatin the bev-; eled gear 53. The beveled gear 52 eing stationary acts as a rack and causes the lever 63 to ascend slightly, rocking the shaft 43. The rocking movement of the shaft 43 will cause the brush 81 to ride off the curved surface 69 of the commutator 67 and the fuel suppl will be. slightl reduced and/or drafts slig tly closed. T is closing of the fuel supply and/or drafts will continue ste b step, the

circuit being completed throu t e various brushes 80,7 9, 7 8 and 77 as the rush 30 wig es across the contact members Y5, Y4, Y3, 2 and Y1. It will be noted that once there lation of the fuel and/or drafts has reache a point where the heat will be supplied at the predetermined tem ratures, say 70 the spring and the sylp on bellows will be ance t ere y causing the contact members 21 and 22 toassume a median position between the contacts 25 and 26, breaking the circuit to both motors. In the normal operation of this device, the contacts will remain as shown in Figure 2, the only chan being that as the tem rature falls slight y contact will be ma e at 25 to increase the supply of heat, and when the bellows expand the contacts 21 and 22 will assume the median position where both circuits are broken. On the other hand, if the temperature increases slightly dontact will be made at 26 and the drafts or fuel supply will close slightly. The apparatus, will continue this balancing or compensating effect thereb holding the temperature substantially cons ant. It will only cause the brushes 29 and 30 to be swung to the extreme point for operating the lever 63 to its extreme limits when there is an abnormal or decided change in temperature. Thus, it will be seen that the device is effective to open the fuel supply and/or drafts to cause the temperature to increase and yet operates to slowly close the drafts and/or fuel supply as the desired temperature is ap reached and then to hold the drafts and uel supply at the point necessary to maintain the predeter- ,mined temperature.

The device will balance between slightly opening and slightly closing the drafts or -fuel as the temperature fluctuates. It will thus be seen that the reversin switches comprising the contacts 21, 25 an 22, 26 are adapted to be actuated or operated by the condition responsive means in advance of and independently of the actuation or operation of the ste -by-step con nectin switches comprising t e contacts 29, 35 an 30, 36.

In operating valves for rubber calender rolls, the valves may be connected to-the shaft 43 b means of gears so that the oscillation of t e shaft 43 will cause the valves to be opened or closed the amount necessary to maintain the proper temperature in the rolls. Likewise, in operating ventilators the arm 63 may be utilized or cars may be attached at' the ends 44, 45 of t e shaft 43.

In operating the device to directly control pressure instead of temperatures, the sylphon ellows instead of being partly filled with volatile liquid, as is the usual ractice can be connected to the pressure line or directl ly connected to the steam-boiler. The spring 1 would be adjusted to balance the steam pressure in the sylphon bellows 12 at the predetermined point. The operation will then be,

as has been'described, to increase or decrease the fuel supply the amount necessary to comensate for a drop or increase in pressure. t is obvious that the device will thereby maintain the pressure at substantially the predetermined point.

Figure 7 shows 'the'invention installed to operate a household heating apparatus. A control or thermostat unit 90 is attached to a wall of a room in the usual manner and is connectedby a multiple cable 91 to a motor unit ,92. This motor unit may be located on the floor or on the side wall of the furnace room. The lever 63 is attached b a chain 98 to the damper control arm 94.- he shaft 43 has attached -to it a short lever 95 which may be utilized to operate an arm 96 adapted to control an oil or as burner.

When the device is used for a coal burning heater the arm 63 and the damped connections may be used. When operatin an oil or gas burner only the arm 95 and t e connecting link 96 will be used since no dampers are nec- 101 is a-capa'citor 103. A capacitor motor 104 is mounted on the base 101 on a standard or support 105. Brackets 106 and 107 are mounted on the base 101 and rovide bearings for a shaft 108. Olampe to the shaft 108 and insulated therefrom by means of an insulating bushing 109 is a commutator 110. Mounted on the shaft 108 is a gear 111 which is adapted to engage with a worm 112. The worm 112 is mounted on a shaft 113, carried by a bearing block 114 secured to the base 101. At the opposite end of the shaft 113 is mounted a gear 115. This gear is adapted to mesh with a worm 116 mounted on the end of the shaft of the motor 104. The commutator 110 as thelever 19 is pivoted to the lever 7 in Figure 2). The lever 122 is provided with contact members 124 and 125 adapted to enthe contacts 133 are in'a higher 'lane than has an arcuate contact face 117. The face 117 is %rovided with stepped edges as is shown in 1 re 9. Thirteen brushes A1, A2, A3, A4, 5, A6, D, C1, C2, C3, C4, C5 and C6 are secured to a support member 118, attached to the brackets 106 and 107. The motor being a ca acitor motor is reversible and causes the sha t 108 to rotate either clockwise or counterclockwise in accordance with the operation of the thermostat or control unit. The contact of tne various brushes on the commutator 110 is broken by the brushes running off the surface 117 at the various steps. It is to be noted that D is always in contact with the pongmutator, and either A6 or C1 are in con- The shaft 108 may be oscillated to the extent permitted by the commutator. The surface of the commutator may, where it is in contact with the brush D, be as great as 360, in which case the shaft 108 can oscillate through 360, but no further. As illustrated in Figures 8, 9 and 10, the shaft 108 can only oscillate 90.

When it is desired that the operating means travel more than 360, as when it is geared to a valve which may require several rotations of the valve stem to fully open and fully close the valve, the o eratm means may be attached to an extension of t e shaft 113, or an intermediate shaft may be geared between the worm 112 and the gear 111, so that the worm 112 will drive an intermediate shaft, whereas the gear 111 will be driven by a gear on theintermediate shaft. Such an arrange ment will permit several rotations of the operatin means and yet keep the oscillationof shaft 08 to 360 or less, as desired.

A modified form of the thermostat or con-' trol unit is shown in Figure 10. This de vice is similar to the device shown in Figure 2 with the exception that the level 119 is a lover of the first-class. The power supply by the sylphon bellows and spring, designated in Flgure 2 as 12 and 17 respectivel 1s applied at the oint- 120 and 121. he lever 122 is pivote to the lever 119 at 123, ust

the faces of the contacts 132. T 1e capacitor 103 is attached to a line voltage shown as 110 volts. The motor 104 is a 23 volt motor. The operating circuit'is as follows:

When contact is made between 124and 126,

the circuit will be through the line D to the brush D, to the commutator 110, to the brush A4, through the lead A4, to the' contact 132 which is in contact with the brush 128, through the lead 130, to the contact 124, through the lead A to the motor which will be caused to rotate in the direction of the arrow marked A. \Vhen the lever 119 is moved to the right, causing the lever 122 to swing so that the point 125 IS in contact with 127, the circuit will be from the capacitor '103 through the brush D, through the commutator 110, through the brush C4, through the line C4, through the brush 129 in contact with the contact points 133, through the lead 131 to the contact 125, the contact 127, through the lead C to the motor, causing the motor to rotate in the direction shown by the arrow C. The shaft, in each instance, will rotate in the direction shown by the arrows A and C corresponding to the circuit enerdampers or fuel supply (corresponding to the lever 63, Figure 5) may be attached to the shaft 108.

From the above description it is evident that the invention is ca able of many and varied uses and is particularly adapted to operate devices to compensate for varying conditions, being adapted to operate the device to its fullest capacity to compensate for widely fiuctuatin conditions or to balance or modulate the device for slight fluctuating conditions. It is also adapted to operate the device to its full capacity for wide fluctuations and reduce its capacity radually as conditions a roach 'normal. enever the word condition is used, it is understood to meancondition of temperature, pressure, humidity and the like.

While only two modifications of the device have been illustrated and described without intending to limitor restrict the invention to the exact construction'shown, the device is capable of many other modifications within the scope of the invention as defined in the appended claims.

I claim:

1. A control device comprising condition responsive means, a first set of switches ada ted to be operated by slight fluctuations in t e condition responsive means, a second set of switches adapted to be connected in circuit with the first set of switches and operated by wider fluctuations in the condition responsive means, a motor device includingoperating means operatively connected to said switches, means for operating the motor.

- step with the fluctuations in the condition responsive means.

3. A control device comprising temperature responsive means, a first set of switches ada ted to be operated by slight fluctuations in he temperature responsive means, a second set of switches adapted to be connected in circuit with the first set of switches and operated by wider fluctuations in the temperature responsive means, .a. motor device including operating means ada ted to be connected to a device to be contro ed operatively connected to said switches, means for moving the operating means step by step to respond to the variations in the temperature responsive means.

responsive means, a first'set o 4. Acontrol device comprising h switc es ada ted to'be operated by slight fluctuations in t e pressure'responsive means, a second set of switches adapted to be connected in circuit with the first set of switches and operated by wider fluctuations in the pressure responsive 'means,-a motor device including operating means ada ted to be connected to a device to be control ed operatively connected to said switches, means for moving the operating means etc by step to respond to t e variations in t e pressure responsive means.

5) A control device comprising condition responsive means, a reversin switch mecha-, nism adapted to be operated y slight variations in the condition res onsive means, a step by step switch mechanism adapted to be operated by wider variations in the condition re onsive means, said reversing switch mechanism being adapted to be operated independently of said step-b -step switch mechanism, a motor device me uding operating means adapted to be connected to a device to be controlled 0 ratively connected to said switches, means or operating said operating means step b step to correspond to the o eration of sai switches.

6. control device comprising temperature responsive means a reversin switch mechanism adapted to be operated by slight variations in the'- temperature res onsive means, a step-by-step switch mec anism adapted to be operated by wider variations in the temperature responsive means, said reversing switch mechanism being adapted to be operated independently of said stepby-step switch mechanism, a -motor device includin operating means adapted to be connected toa device t6 be controlled operatively connected to-said switches, means for operating said opera-ting means step by step to correspond to the operation of said switches. I

7. A control device comprising pressure responsive means, a reversin switch mechanism adapted to be operatediiy slight variations in the pressure-responsive means, a stepby-step switch mechanism adapted to be operated by wider variations in the pressure responsive means, said reversing switch mechanism bein ada ted to be operated independently o sai step-by-step switch mechanism, a motor device including operating means adapted to be connected to a device to 'be controlled operatively connected to said switches, means for operating said operating means step by step to correspond to the operation of said switches.

8. A control device comprising condition responsive. means, a first set of switches ada ted to be operated-by slight fluctuation; in t e condition responsive means, a second set of switchesadapted to be connected in circuit with the first set of switches and op- .erated by: wider fluctuations in the condition responsive means, a motor device including operating means adapted to be connected to a device to be controlled operatively connected to said switches, means for moving the operating means to compensate for varianected to said switches, means for operating said operating means to the maximum capacity, and means to return said operating means step by step to its normal position as conditions tend to approach normal.

.10. A control device comprising a lever, condition responsive means operatively connected to one end of said lever, two sets of contact members carried by said lever, contact members adapted tocontact with one set of contact members on said lever, a series of contact members adapted to contact with the other set of contacts on said lever, a motor mechanism comprising a shaft, an electric motor adapted to operate said, shaft, a commutator carried on said shaft, a series of.

brushes for said commutator each respectively connected elec'trically'with one of the series of contact members, and an operating member connected to said shaft adapted to assume varying operating positions in response to the variations in the condition responsive means.

11. A control device comprising a lever, condition responsive means operatively connected to one end of said lever, a second lever pivoted on the opposite end of the first lever, a set of contact members carried by one end of the second lever, a secondset of contact members carried on the o posite end of said second lever, contact members adapt-- ed to contact-with the first set of contact members and a series of contact members adapted to contact with the second set of contact members, a motor mechanism comprising a shaft, an electric motor geared to said shaft, a commutator carried on said shaft, 9. series of brushes for said commutator electrically connected with said series of contact members, an operating member connected to said shaft adapted to assume varying operating positions in response to the variations in the condition responsive means.

12. A control device comprising a lever, a sylphon bellows operatively connected to one end of said lever yieldable means opposin the action of said sylphon bellows, a secon lever pivoted on the opposite end of the first lever, a set of contact members carried by' one'end of said second lever, a second set of contact members carried on the opposite end of said second lever, contact members adapted to contact with the first set of contact members and a series of contact members adapted to contact with the second set of contact members, a motor mechanism comprising a shaft, an electric motor geared to said shaft,- a commutator carried on said shaft, 0. series of brushes for said commutator electrically connected with said series of contact members, an o crating member connected to said shaft a apted to assume varying operating positions in response to the expansion or contraction of the sylphon bellows.

13. A control device com rising alever, a sylphon bellows operative y connected to said lever, a resilient member opposing the action of said syl hon bellows, a second lever pivoted on the rst lever, 11. set of contact members carried by one end of the second lever, a second set of contact members carried on the opposite end of said second lever, contact members adapted to contact with the first set of contact members and a series of contacts adapted to contact with the second set of contact members, a motor mechaversible motor means adapted to'be operative- 1y connected to a condition changing means, condition responsive means, and connections between the condition responsive means and said reversible motor means to function regardless of the speed and distanceiof movement in either direction of the condition re sponsive means.

15. A control device com rising a reversible motor means adapte to be opera tively connected to a condition changing means, condition responsive means, reversing switches and connecting switches adapted to be actuated by the condition responsive means, and operating and disconnecting switches for the reversible motor. means adapted to have connection with the reversing switches and connecting switches, a sutiicientnumber of said 0 crating and disconnecting switches being in closed position to cause said reversible motor means to function regardless of the speed and distance of movement in either direction of the condition responsive means.

16. A control device com rising a reversible motor means adapte to be operatively connected to a condition changing means, condition responsive means reversing switches adapted to be actuated by the condition responsive means, step-by-step connecting switches adapted to be successively actuated b the condition responsive means, and stepy-step' operating and disconnecting switches for the reversible motor means adapted to have connection with the reversin switches and connecting switches and to i iave step-by-step movement corresponding to any step-by-ste actuation of the connecting switches, a su cient number of said operating and disconnecting switches bein in closed position to cause said revei'si le' motor means to'function regardless of the speed and distance of movement in the rcve sible motor means adapted to cause either. direction of the condition responsive means.

17. A control device comprising a re-- versible motor means adapted to be operatively connected to a condition changing means, condition responsive means, two reversing switches adapted to .be actuated by the condition res onsive means, step-by-step connecting switc es adapted to 'be successively actuated by the condition responsive means, and two sets of reversible, step-bystep operating, and disconnecting switches for the reversible motor means, each set being adapted to be connected to a corresponding reversing switch and to the connecting switches and to have step-by-step movement in either of opposite directions de ending on which reversing switch is actuate and corresponding to any step-by-step actuation of t e connecting switches, the two sets of operating and disconnecting switches being so constructedthat they are operable to cause the motor means to be actuated step by step in either of o posite directions, the switches of one set being successively opened to disconnect the motor means during its step-b step actuation in one direction, while t e swltches of the other set are corres ondin ly successively and 'additively close where y said reversible motor means will function regardless of the speed and distance of movement in either direction of the condition responsive means.

18. A control device com rising a reversible motor means adapts 'to be operatively connected to a condition changing a means, condition responsive means, two reversing switches adapted to be actuated by the condition responsive means, two sets of V step-by-step connecting switches adapted to be successively actuated by the condition responsive means and two sets of' r versible step-by-step operatin and dlSCONQBOtiD switches for the revers1 le motor means, eac set of operating and disconnecting switches being. a apted to be connected to a corresponding reversing switch and to a corresponding set of connecting switches and to have step-by-step movement ineither of opposite. directions dependin 'on which reversmg switch is actuated an corresponding to. any step- -step actuation ofthe connectmg switches, t e two sets of. operating and dis-- connecting switches being so constructed that they are operable to cause the-motor means.

to be actuated step-by-step in either of oppo- -4 site directions, the switches of one set being successively opened to disconnect the motor means during its ,step-by-step actuation in" one direction, while the switches of the other setr are correspondingly successively and additively closed whereby said reversible motor means will function regardless of the speed and distance of movement in. either di- 55 rection of the condition responsive means.

'19. A control device comprising a reversible motor -means adapted to be operatively connected to a, conditlon changing means, a lever pivoted intermediate its ends, condition res onsive means operatively connected to sai lever, reversing switches ada ted to be electricall connected to the reversible motor means an actuated b one end ofsaid lever, and connecting switc es adapted to be electrically connected to the reversible motor means and actuated by the other end of said lever.

20. A control device comprising a reversible motor means adapted to be operatively connected to a conditlon changing means, a lever pivoted intermediate its ends, condition res sai lever, two reversing switches adapted to be electrically cennected to the reversible motor means and actuated by one end of said lever, and two sets of connecting switches adapted to be electrically connected to the reversible motor means and actuated by the other end of said lever, each reversing switch being electrically connected to its corresponding set of connectin switches.

21. A control device comprising a reversible motor means adaptedto be operatively connected to a conditlon changing means, a lever pivoted intermediate its ends,'condition responsive means operatively connected to sai lever, two reversing switches adapted to be electrically connected to the reversible motor means and actuated by one end of said lever, and two sets. of connecting switches adapted to ,be electrically connected to the reversible motor means and actuated by the other end of said lever, each reversing switch being electrically'connected to its corresponding set of connecting switches, the construction being such that when the condit on res onsivemeans moves the lever in one direct1on one reversin switch is closed to complete the circuit to t e reversible motor means through a switch ofone set of connectmg switches and the other; reversing switch is opened to break the circuit to the reversible motor means throu h the other set of connectin switches, an vice ver'sa.

22'. control device comprising a reversible motor means adapted to be' operatively connectedto a condition changing means, two reversin switches adapted to be electrically connects to the reversible motor means, two sets of connecting contacts adapted to be electrically connected to the reversible motor means, a member carr g two connecting contacts, each .of whic is adapted to sucnsive means operatively connected to cessively make connection with the contacts of its corresponding set of connecting contacts, and condition responsive means operatively connect'edto said member and adapted to actuate said reversible switches independently of said connectin means, the construction being such that w en the condition responsivc means successively moves the member but slightly in opposite directions, first one reversing switch 18 closed to actuate the reversible motor means in one direction and t the other reversing switch is opened, and then said one reversing switch is opened and said other reversing switch is closed to reverse the reversible motor means, all without disconnecting whatever connecting switches hap en to be closed at the time, and when the mem r is given a considerable movement in either of opposite directions, first a reversing switch is closed and then on further movement of the member in the same direction, each connecting contact on the member successively makes connection with the contacts of its corresponding set of contacts.

23. A control device comprising a reversible motor means adapted to-be operatively connected to a condition changing means, condition responsive means, connecting switches adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means, and reversing switch means adapted to be electrical- 1y connected to the reversible motor means and to be actuated by the condition responsive means independently of actuation of the connecting switches, to reverse the reversible motor means.

24. A-control device comprising a reversible motor means adapted to be operatively connected to a condition changing means, condition responsive means, connecting switches adapted to be electrically connecte to the reversible motor means and to be actuated b the condition responsive means, and reversing switch means adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means in advance of actuation of the connecting switches, to reverse the reversible motor means.

25. A control device comprisng a reversible motor means ada ted to be operatively connected ton condition changing means, condition responsive means, connecting switches adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means, and reversing switch means adapted to be electrical] connected to the reversible motor means an to be actuated by the condition responsive means without disconnecting whatever connectin switch happens to be connected to the revers1- ble motor means, to reverse the reversible motor means.

26. A control dev ce comprising a reversible motor means adapted to be operatively connected to a condition changing means,-

coiidition responsive means, two sets of connecting switchjes adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means, and reversing switch means adapted be actuated by to be electrically connected -to the reversible actuated by the condition responsive means in advance of actuation of the connecting switches, to reverse the reversible motor means.

27. A control device comprising a reversible motor means adapted to. be operatively connected to a.condition changing means, condition responsive means movable in opposite directions, two sets of connect' switches adapted to be electrically connect to the reversible motormeans, reversing switch means adapted to be'electrically connected to the reversible motor means and to the condition responsive means to reverse the reversible .motor means, the construction being such that when the condition responsive means successively moves but slightly in opposite directions, the reversing switch means is successivel actuated to successively reverse the reversi le motor means, all without disconnecting whatever connecting switches happen to be closed 'at the time, and when the condition responelectrically connected to the reversible motor means and to be actuated by the condition responsive means, and reversing switch means adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means in advance of actuation of the connecting switches, to reverse the reversible motor means.

29. A control device comprising a reversible motor means adapted to be operatively connected to a condition changing means.

condition responsive means, operating and disconnecting switches adapted to be electrically connected to the reversible motor means, connecting switches adapted to be electrically connected to the reversible motor means and to be actuated by the condition responsive means, and reversing switch.

means adapted to be electrically connected to .the reversible motor means and to be actuated by the condition responsive means without disconnecting whatever connecting switch happens to be connected to the reversible motor means,'.to reverse the reversible motor means.

30. A control device comprising condition responsive means, a first set of switches, a first means 0 erating said switches in response to slig t reversals in movement of said condition responsive-means, a second set of switches, means independentof said-first means operating said second set of switches in response to continued movement of said condition responsive means in either direction, condition control means, and means controlled by said switches for operating said condition control means.

.31. A control device comprising condition control means, condition res and operatin means actuate by said condition responsive means and controlling the operation of said conditionoco ntrol means,

said operating means being adapted to cause a change in said condition control means 11 to its maximum capacity in re onse to a su den wide change of saidfcon ition respon-' sive means and to progressively restore said 26 condition control means to normal as the conldition responsive means approaches norma 32. A control device comprising a revers ible motor means adapted to be operatively :0 connected toa condition changing means, a pivoted lever, condition res nsive means operatively connected to sai lever, reversing switches, and step-by-step switches connected to said reversible motor means, said as reversing switches being actuated by slight reversals in movement of said lever actuation of said step-by-st'ep switc es and independently of the position of said stepby -step switches, said step-by-step switches 40 being progressively actuated in use to continued movement of said lever in either direction.

88. control device comprising a lever, condition naive means operatively con- 0 nected'to sai lever, two sets of contact members carried by saidlever, contact members adapted to contact with one set of contact members on said lever, a series of contact members adapted to contact with the other set of contacts on said lever, a motor mechanism comprising a sha an electric motor adapted to operatesaid s aft, a commutator carried on said shaft, a series of brushes for said commutator, each 'vely connected ll electrically with one of t e series of contact members, and an' 0 rating member conpected to said shaft a apted to assume va mgoperatin positions in response to t e vanationsin hecondition 0o 84. A control device comprising a reversible motor means ada ted to be operatively connected topa condition changing means, a first pivoted lever, condition naive means operativelyiconnected to said ever, a

66 second pivoted lever controlled by said first riorto' naive means.

lever a reversin .switch, and connecting switches connec to said reversible motor me said reversin switch being actuated by sai second lever 1n response to reversals of said condition nsive means and said connecting switches ing actuated by one of said levers in response to continued movement of said condition responsive means in either direction. j

35. A control device comprising a reversible motor means adapted to be operatively connected to a condition changing means,'a pivoted lever, condition: responsive means adapted to actuate said-lever, a second lever actuated by said first lever, a double-throw 'tch actuated by said second lever in res use to reversals in movement of said contion res nsive means a step-by-stcp switch, an means actuating said step bystep switch by one of said levers in response to continued movement of said condition responsive means in either direction. 36. A control device comprising a reversible motor means adapted to beoperatively connected to a condition changing means, a pivoted lever, condition responsive means adapted to actuate said lever, a second lever actuated by said first lever, a double-throwswitch actuated by said second lever, a pair of step-by-step switches connected respectively to the poles of 1 said double-throw switch 'and means controlled in accordance with t e tion of one of said levels for actuatingmh of said step-by-step switches. 87. A control device comprising a reverse ble motor means adapted to operatively connected to a condition changing means, a pivoted lever, condition ve -means adapted to actuate said lever, a second lever actuated by said first lever, a double-throw switch, a ste -by-ste switch, and means whereby sai secon lever independently actuates both of said switches.

.In testimon hereof, I have. afixed my signature to specification. no

HAZOR J. SMITH.

CERTIFICATE-0E1 CORRECTION.

Patent No. 1,896,207. February 1, 1933.

.HAZOR- 3. SMITH.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 9,'line 128, claim 22, for "reversible" read "reversing", and line 129, for "means"read "contacts'f;

and that the said Letters. Patent should be read with these corrections therein that the samemay conform to the record of the case in the Patent Office.

Signed and sealed this 28th day ofFebruary, A. D.- 1933.

, a M. ,J. Moore, (Seal) i Acting Commissioner of Patents. 

